Method and System for Improving Security of the Key Device

1. A method for improving security of a key device, comprising steps of: A) connecting the key device with a computer, and authenticating a device user who inputs a PIN code by the key device, after which if authentication is passed, the computer receives the data input by the user and transfers the data to the key device; B) displaying the data received from the computer by the key device, and making digital signature or encryption of the data input by the user after receiving a confirmation information input by the user according to the data displayed by the key device; C) sending the digital signature to a server through the computer; D) authenticating the digital signature by the server; E) returning an error information in response to failing the authentication of the digital signature; and F) completing a transaction in response to passing the authentication of the digital signature, wherein the confirmation information is input by the user with an input component of the key device; the Step B further comprises sub-steps in which the key device generates a random authentication code and then displays it; and verifies whether the confirmation information input is consistent with that random authentication code currently after receiving the confirmation information input by the user from the computer; if so, the key device makes digital signature or encryption of the data input by the user; and the authentication code generated randomly by the key device differs every time.

2. The method for improving security of the key device in accordance with claim 1 , wherein in the step B, the key device displays the data after receiving the same from the computer; and makes digital signature or encryption of the data input by the user after receiving the confirmation information input by the user when the data displayed in the key device is consistent with the input one.

3. The method for improving security of the key device in accordance with claim 1 , wherein in the step B, the key device resolves the data transferred from the computer to acquire an important data after receiving the same, then displays the important data; and makes digital signature or encryption of the data input by the user after receiving the confirmation information input by the user when the important data displayed in the key device is consistent with the input data.

4. The method for improving security of the key device in accordance with claim 1 , wherein in the step B, the user uses an input device of the key device to input confirmation information into the key device.

5. The method for improving security of the key device in accordance with claim 4 , wherein the input device is a single button, number keys, a light-sensitive part, a fingerprint scanner, a voice control switch, a temperature sensor, a pressure sensor, a vibration sensor, an acceleration sensor, a magnet sensor, or an electric field sensor.

6. The method for improving security of the key device in accordance with claim 1 , wherein to authenticate the user in step A is to authenticate whether PIN code or biometrics input by the user is true.